Answer:
7.16 × 10⁻³ M
Explanation:
Let's consider the reduction reaction of copper during the electroplating.
Cu²⁺(aq) + 2 e⁻ ⇒ Cu(s)
We can calculate the moles of Cu²⁺ present in the solution using the following relations.
- 1 mole of electrons has a charge of 96486 C (Faraday's constant).
- 1 mole of Cu²⁺ is reduced when 2 moles of electrons are gained.
The moles of Cu²⁺ reduced are:
of Cu²⁺ are in 0.300 L of solution.
[Cu²⁺] = 2.15 × 10⁻³ mol/0.300 L = 7.16 × 10⁻³ M
Sodium Carbonate(NaCO3) gives off heat hence the reactions involving Na2CO3 are exothermic.
Hope this helps!
-1
An ion is an atom which has gained or lost electrons.
Atoms want to have full outer shells of electrons.
Electrons are negative.
Fluorine has 7 electrons in its outer shell. When it gains one to fill its shell it will be made negative.
Thus the charge of a fluorine ion is -1
One of the major lab accidents was of fire when a gas was exposed to heat.
<u>Explanation:</u>
The mishaps or the accidents that take place in the laboratory while experimenting are known as the laboratory accidents. Some of the laboratory accidents are chemical spills, fire or explosion, personal injuries and so on.
One of the major lab accidents was of fire when methane gas was exposed to heat. Because of this it led to fire during the experiment. At the time of the experiment, the personal protective equipment worn were the lab gloves, lab coat and the protective eye care. To avoid such kind of accidents, more care and attention should be paid while experimenting. It should be made sure that there are proper equipment in case any accident takes place.